Honeywell S8910U, Installation Instructions And Safety Information, Page: 8 / 16

69-0845—2
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S8910U UNIVERSAL HOT SURFACE IGNITION MODULE
4. Make sure the transformer has adequate VA.
The ignition module requires 0.4A at 24 Vac.
Add the current draws of all other devices in
the control circuit, including the pilot and main
valves in the gas control, and multiply by 24 to
determine the total VA requirement of these
components. Add this total to 9.6 VA (for the
ignition module). The result is the minimum
transformer VA rating. Use a Class II trans-
former when replacement is required.
5. Check that L1 (hot) and L2 (neutral) are wired
to the proper terminals.
1. Connect the wires to the S8910U Ignition Module as
shown in Table 4. Make sure that adequate system
ground is provided as indicated in the wiring table.
See Fig. 3 through 5. Where a change in quick-
connect is required, cut off the original quick-
connect, strip the leadwire and firmly crimp in place
the proper quick-connect supplied.
2. Verify the thermostat anticipator setting as explained
in the preceding IMPORTANT, item 4.
Table 4. Replacement Wiring Terminals.
a
Remove quick-connect and replace with the included 1/4 in. quick-connect.
b
Use green adapter cable (provided) to connect S8910U GND (BURNER) terminal to chassis ground.
c
Do not use the S8910U VALVE (GND) terminal. VALVE (GND) and 24V (GND) are interconnected in the appliance
wiring.
d
Remove quick-connect and replace with the included 3/16 in. quick-connect.
e
Do not use this terminal if model being replaced does not have 120V neutral power supply connection.
f
Use the black wire on the included adapter cable.
g
Use the orange wire on the included adapter cable.
h
On remote sense models, remove jumper quick-connect from S8910U sense terminal, cut jumper wire at circuit board
and discard. On local sense models, leave black jumper connected.
i
Remove jumper from S8910U sense terminal, cut jumper wire at circuit board and discard.
Replacement Control Original Control
Terminal Function
S8910U
Terminal
Honeywell
S89/S890 Terminal
White Rodgers
50E/F47 Terminal
Robertshaw
HS780 Terminal
Burner Ground Connection GND (BURNER) GND (BURNER)
a
GND TR (GND CLIP)
b
Tranformer Secondary
(unswitched leg) 24V (GND) 24V (GND)
a
TR GND
Main Valve Common VALVE (GND) VALVE (GND)
a
MV
a
(next to
TR terminal)
—
c
Transformer Secondary
(switched leg) 24V 24V
a
TH TH
Main Valve Operator VALVE VALVE MV
d
VALVE
d
120 Vac Neutral Leg
Power Supply L2 120V NEUTRAL
e
L2 120V NEUTRAL — L2
120 Vac Hot Leg Power
Supply L1 120V HOT L1 120V HOT L
f
L1
Hot Surface Igniter Element HSI 120V NEUTRAL
e
HSI 120V — IGN
Hot Surface Igniter Element HSI 120V HOT HSI 120V IGN
g
IGN
Flame Sensor SENSE
h
SEN
h
FP
i
RS
h